Introduction to the Alchemy Furnace: On Zhanggong Island, there is a rock shaped like an incense burner. There is a concave circular pit on the rock, which is very similar to the mouth of a stove holding an iron pot. According to legend, it is the immortal Laozi who made alchemy. The "alchemy furnace" used at that time has led to mythical stories such as "Laozi made alchemy", "Laozi built a bridge", "Laozi cut stones", "Sacred fire refines mountains".
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